Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62a9ef54349ee01…

MALICIOUS

PDF

76.2 KB Created: 2021-06-08 21:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ea15ba711c2623326b114c8e7d9b0aa SHA-1: 80899e391a67b84b10174ea7b1dc06ade7d35447 SHA-256: e62a9ef54349ee015ecc3e8f82ad025842fb1c45242412c2dc02d6efd10b3238
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support this assessment. The ClamAV detection as 'Pdf.Phishing.Trojan' indicates a known malicious pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=dead+cells+android+apk
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1fda5dd01504d074cf06deac7dde995/kitosi.pdf
    • https://diedacorporation.net/freesiafiles/file/94252018736.pdf
    • http://accessiblevehicleservices.com/userfiles/file/13788695345.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ec8b3907---50966880848.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231e0e64b7---75505654357.pdf
    • https://mytopics.it/uploads/file/89949535909.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mq7155u61fgg7i8rn80u7iv0j4/waxizigiri.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/83551424588.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb71b5dde---51055888285.pdf
    • http://engroupe.ca/aym_image/files/10433332129.pdf
    • http://zaun-produzent.de/userfiles/file/99518203253.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b26832e4b64---kigidepamasabaginev.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d0118dede0ce6361c39e3c191be9872d/79929004071.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f048870f6---xigawunij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin
4a0c149529844ff0247a8c5822ff5340e584cb42bd9c0543af93a9622572a055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 5132 bytes
font_01_sfnt_off0000fd3d.bin
a84ef11e28fee809c906cc0c123aca3cf30bb0c54cd8e2e52342996020c3be43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 11436 bytes

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